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An in-situ remediation method for heavy metal-contaminated soil

An in-situ remediation and contaminated soil technology, applied in the field of soil remediation, can solve the problems of soil pollution, time-consuming, downward leakage, etc., and achieve the effect of super large specific surface area, high reactivity, and strong removal ability

Inactive Publication Date: 2022-02-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no matter which fixative is used, the heavy metals that are finally adsorbed and passivated will remain in the soil, and the bioavailability may also be restored as the environmental conditions change, resulting in repeated soil pollution; phytoremediation is a green pollution control It has high ecological benefits, but it has the disadvantages of insufficient varieties, long time consumption, and agricultural production reduction.
Adsorbents can absorb or transform heavy metals and make them migrate, but they are difficult to separate after entering the soil, and may leak downwards, polluting groundwater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Chitosan is dissolved in 15% acetic acid solution, ferric sulfate is added thereto, feed nitrogen deoxygenation 1h, add potassium borohydride in the mixed solution under mechanical stirring (300 revs / min), high-speed stirring (3000 revs / min) 1h to obtain the mixed solution, polyvinyl alcohol was added in the mixed solution, after the addition was completed, 85°C was airtightly stirred (500 rpm) for 3h, and it was made into a spinning solution, wherein the spinning solution was composed in parts by weight, 15 parts of chitosan, 28 parts of acetic acid, 15 parts of iron sulfate, 4 parts of potassium borohydride, 80 parts of polyvinyl alcohol. The electrostatic spinning humidity is 40%, the voltage is 25kV, the distance from the needle to the receiving plate is 19cm, and the chitosan / zero-valent nano-iron composite fiber is obtained;

[0023] (2) The chitosan / zero-valent nano-iron composite fiber and glass fiber in step (1) are compositely twisted in a mass ratio of 1...

Embodiment 2

[0027] (1) Dissolve chitosan in 20% formic acid solution, add ferric phosphate therein, pass into nitrogen deoxygenation 2h, add potassium borohydride in the mixed solution under mechanical stirring (500 rpm), high-speed stirring (5000 rpm / min) 1h to obtain a mixed solution, add polyvinyl alcohol to the mixed solution, after the addition is completed, 90 ° C airtight stirring (1000 rpm) 3.5h, made into spinning solution, wherein the composition of spinning solution is calculated by weight , wherein 17 parts of chitosan, 30 parts of formic acid, 13 parts of iron phosphate, 3 parts of potassium borohydride, 75 parts of polyvinyl alcohol. The electrostatic spinning humidity is 45%, the voltage is 28kV, the distance from the needle to the receiving plate is 22cm, and the chitosan / zero-valent nano-iron composite fiber is obtained;

[0028] (2) The chitosan / zero-valent nano-iron composite fiber of step (1) and the glass fiber are compositely twisted into a composite adsorption rope...

Embodiment 3

[0032] (1) Chitosan is dissolved in 25% acetic acid solution, ferric sulfate is added thereto, feed nitrogen deoxygenation 1h, under mechanical stirring (1000 revs / min), add potassium borohydride in the mixed solution, high-speed stirring (4000 revs / min) 1h to obtain the mixed solution, polyvinyl alcohol was added to the mixed solution, after the addition was completed, 95°C was airtightly stirred (400 rpm) for 5h, and it was made into a spinning solution, wherein the spinning solution was composed in parts by weight, Among them, there are 19 parts of chitosan, 25 parts of acetic acid, 12 parts of iron sulfate, 4 parts of potassium borohydride, and 70 parts of polyvinyl alcohol. The electrostatic spinning humidity is 50%, the voltage is 25kV, the distance from the needle to the receiving plate is 23cm, and the chitosan / zero-valent nano-iron composite fiber is obtained;

[0033] (2) The chitosan / zero-valent nano-iron composite fiber and glass fiber of step (1) are compositely ...

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PUM

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Abstract

The invention discloses an in-situ repair method for heavy metal polluted soil; chitosan and iron salt are mixed to prepare spinning solution, and chitosan / zero-valent nano-iron composite fiber is obtained through electrostatic spinning, and then passed through a twisting machine Twist with glass fiber to make a composite adsorption rope with heavy metal adsorption and reduction ability and a certain strength, and make it into a net, bury it in the soil polluted by heavy metals, take it out after a period of time, and complete the in-situ adsorption and removal of heavy metals in the soil . This method realizes the in-situ remediation of heavy metal-contaminated soil, is environmentally friendly, efficient, and easy to operate, and overcomes the disadvantage that traditional adsorption materials are difficult to separate from the soil.

Description

technical field [0001] The invention relates to soil remediation, in particular to an in-situ remediation method for heavy metal polluted soil. Background technique [0002] Heavy metal-contaminated soil has the characteristics of long cycle and difficult treatment. The current soil remediation methods are ineffective and expensive. Therefore, the remediation of heavy metal-contaminated soil has become a major issue in the field of environmental protection. Heavy metal pollution not only causes changes in the composition, structure, and function of soil, but also inhibits root growth and photosynthesis of crops, resulting in crop yield reduction or even failure. More importantly, heavy metals may also migrate to animals and humans through the food chain, seriously endangering the health of animals and humans. Cadmium rice, arsenic poisoning, blood lead and other heavy metal pollution hazards have been frequently reported in recent years. [0003] The in-situ treatment tech...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 叶勇张萌
Owner SOUTH CHINA UNIV OF TECH
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